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By rapidly manipulating colored oil droplets stacked on top of each other, a new electrowetting (EW) technique could lead to the development of electronic paper displays that can produce high-resolution color video. Displays that use the EW effect could have several advantages over today’s e-readers and other portable flat panel displays, most of which are based on electrophoretic (EPh) technology.

Researchers have demonstrated a vertical stack approach for electrowetting displays that can produce high-resolution color video. Top: A diagram of the device structure. Bottom left: Photographs of the pixel array with all pixels off (a) and on (f); numbers indicate the voltage applied to each layer. Bottom right: Graph showing the switching speed of each color.